99.9% of the time I'm a no. But, I think in rare circumstances, where you are intentionally wronged by someone, that committing a wrong that is neither illegal nor malicious, is fine.
For example, someone sells me a counterfeit piece of software off eBay. I don't want to get in trouble for sending counterfeit software through the mail back to the guy just to get Paypal to accept a full refund. So, I'd just send a small empty box to satisfy Paypal's tracking requirements to getting refunded on the item.